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Artan, who was shot and killed during his attack Monday, was a Somali refugee who moved to Pakistan with his family in 2007 before relocating to the U.S. in 2014 as a legal permanent resident.

During the presidential campaign, Trump often questioned the number of refugees the U.S. takes in from Muslim countries and whether they are properly vetted.

He even suggested that, as president, he would consider placing a temporary ban on Muslims entering the country, later clarifying his position as a ban on individuals from countries with high rates of terrorism.

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Trump’s comment that Artan “should not have been in our country” drew a strong negative reaction from some on Twitter.

On Tuesday, ISIS took credit for Artan’s attack, saying through its Amaq news agency, “The executor of the attack in the American state of Ohio is a soldier of the Islamic State and he carried out the operation in response to calls to target citizens of international coalition countries.”

Prior to launching the attack, Artan reportedly issued a warning on his Facebook page.

The post read, “By Allah, we will not let you sleep unless you give peace to the Muslims. You will not celebrate or enjoy any holiday. Btw, every single Muslim who disapproves of my actions is a sleeper cell, waiting for a signal. I am warning you Oh America.”

The investigation into Monday’s attack, which left 11 people injured, is ongoing.

Some observers placed blame on Ohio Gov. John Kasich for opening the state to radical Islamic refugees.